Cologne is one of the most visited cities in Germany, and even if you only have a weekend, you have plenty to see and do. Cologne Cathedral is a must see for any visitor to the city. The Hohenzollern Bridge is also quite an extravagant example of industrial architecture and know how. Cologne was a great medieval city and the Ulrepforte and city walls that can still be seen really give you a sense of what the city would have been like in the days of the Holy Roman Empire.
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